7x-3+x=21

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Solution for 7x-3+x=21 equation: 


Simplifying
7x + -3 + x = 21

Reorder the terms:
-3 + 7x + x = 21

Combine like terms: 7x + x = 8x
-3 + 8x = 21

Solving
-3 + 8x = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '3' to each side of the equation.
-3 + 3 + 8x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 8x = 21 + 3
8x = 21 + 3

Combine like terms: 21 + 3 = 24
8x = 24

Divide each side by '8'.
x = 3

Simplifying
x = 3

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